Go for Jekyll-Bootstrap [1]. I think it's pretty much what you're looking for and is a breeze to use. I use it for my blog [2] too and here's why:

1. Static blog generator = blazing fast and no more managing databases.

2. Hosted on Github for free.

3. Love writing posts in Markdown!

It's pretty easy to set up and has nice documentation. In case you have trouble using it I'll be happy to help. (You could even fork into my blog's repo [3] if you like and get started.)

[1]: http://jekyllbootstrap.com/

[2]: http://blag.diwank.name/

[3]: https://github.com/creatorrr/I-Blag-Too/tree/gh-pages